Expand: (3a+4b+5c)^2
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using the formula (a+b+c)^2 = a^2+b^2+c^2+ 2(ab+bc+ca) you can find the following answer:
9a^2+16b^2+25c^2+ 24ab+20bc+15ca
9a^2+16b^2+25c^2+ 24ab+20bc+15ca
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